PyAPI_FUNC(type):申明一个公共的Python API函数并且返回一个PyObject*代表对应的类型
PyAPI_DATA(type): 声明公共的Python数据和类型
PyMODINIT_FUNC: 一个Python模块初始化函数。如果这些函数是在Python内核的，他们就提供Python的内核。如果是一个扩展的模块。那可能需要拓展库支持平台的外部连接
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/*
All windows ports, except cygwin, are handled in PC/pyconfig.h.
Cygwin is the only other autoconf platform requiring special
linkage handling and it uses __declspec().
*/
/*
除了cygwin之外的所有Windows socket 文件都在PC / pyconfig.h中处理。
*/
#if defined(__CYGWIN__)
# define HAVE_DECLSPEC_DLL
#endif
/* only get special linkage if built as shared or platform is Cygwin */
#if defined(Py_ENABLE_SHARED) || defined(__CYGWIN__)
# if defined(HAVE_DECLSPEC_DLL)
# if defined(Py_BUILD_CORE) || defined(Py_BUILD_CORE_BUILTIN)
# define PyAPI_FUNC(RTYPE) __declspec(dllexport) RTYPE
# define PyAPI_DATA(RTYPE) extern __declspec(dllexport) RTYPE
/* module init functions inside the core need no external linkage */
/* except for Cygwin to handle embedding */
# if defined(__CYGWIN__)
# define PyMODINIT_FUNC __declspec(dllexport) PyObject*
# else /* __CYGWIN__ */
# define PyMODINIT_FUNC PyObject*
# endif /* __CYGWIN__ */
# else /* Py_BUILD_CORE */
/* Building an extension module, or an embedded situation */
/* public Python functions and data are imported */
/* Under Cygwin, auto-import functions to prevent compilation */
/* failures similar to those described at the bottom of 4.1: */
/* http://docs.python.org/extending/windows.html#a-cookbook-approach */
# if !defined(__CYGWIN__)
# define PyAPI_FUNC(RTYPE) __declspec(dllimport) RTYPE
# endif /* !__CYGWIN__ */
# define PyAPI_DATA(RTYPE) extern __declspec(dllimport) RTYPE
/* module init functions outside the core must be exported */
# if defined(__cplusplus)
# define PyMODINIT_FUNC extern "C" __declspec(dllexport) PyObject*
# else /* __cplusplus */
# define PyMODINIT_FUNC __declspec(dllexport) PyObject*
# endif /* __cplusplus */
# endif /* Py_BUILD_CORE */
# endif /* HAVE_DECLSPEC_DLL */
#endif /* Py_ENABLE_SHARED */
/* If no external linkage macros defined by now, create defaults */
#ifndef PyAPI_FUNC
# define PyAPI_FUNC(RTYPE) RTYPE
#endif
#ifndef PyAPI_DATA
# define PyAPI_DATA(RTYPE) extern RTYPE
#endif
#ifndef PyMODINIT_FUNC
# if defined(__cplusplus)
# define PyMODINIT_FUNC extern "C" PyObject*
# else /* __cplusplus */
# define PyMODINIT_FUNC PyObject*
# endif /* __cplusplus */
#endif
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